Re: preprocessor/5899: -M disables -dM

[Neil Booth <neil@daikokuya.demon.co.uk>]

The following reply was made to PR preprocessor/5899; it has been noted by GNATS.

From: Neil Booth <neil@daikokuya.demon.co.uk>
To: Andreas Schwab <schwab@suse.de>
Cc: gcc-bugs@gcc.gnu.org, gcc-gnats@gcc.gnu.org
Subject: Re: preprocessor/5899: -M disables -dM
Date: Sat, 9 Mar 2002 21:08:49 +0000

 Andreas Schwab wrote:-
 
 > glibc uses the equivalent functionality provided by SUNPRO_DEPENDENCIES:
 
 Ah, OK.  Would you confirm this works for you?  If so, I'll send a
 formal patch and explicitly document this behaviour.
 
 Neil.
 
 
 Index: cppinit.c
 ===================================================================
 RCS file: /cvs/gcc/gcc/gcc/cppinit.c,v
 retrieving revision 1.202
 diff -u -p -r1.202 cppinit.c
 --- cppinit.c	2002/02/23 13:42:40	1.202
 +++ cppinit.c	2002/03/09 21:06:21
 @@ -1886,11 +1886,9 @@ init_dependency_output (pfile)
         with -o.  out_fname is non-NULL here.  */
      CPP_OPTION (pfile, deps_file) = CPP_OPTION (pfile, out_fname);
  
 -  /* When doing dependencies, we should suppress all output, including
 -     -dM, -dI etc.  */
 +  /* When doing dependencies, suppress normal preprocessed output.
 +     Still do -dM, -dI etc. as e.g. glibc depends on this.  */
    CPP_OPTION (pfile, no_output) = 1;
 -  CPP_OPTION (pfile, dump_macros) = 0;
 -  CPP_OPTION (pfile, dump_includes) = 0;
  }
  
  /* Handle --help output.  */